Oh yes that is not going to work like that if the dark color scheme is selectable.
I think the best option you can do is create a custom color definition for this and you can use this color variable for header icons.
Create a theme component and add the following to Color Definitions tab
Set the secondary-low color code to $dark-theme-header-icons and secondary color code to $light-theme-header-icons
$dark-theme-header-icons: #e9e9e9;
$light-theme-header-icons: #222;
$header-icons: dark-light-choose($light-theme-header-icons, $dark-theme-header-icons);
:root {
--custom-header-icons: #{$header-icons};
}
After this you can use this --custom-header-icons color variable to the header icons color.
.d-header-icons .d-icon {
width: 100%;
line-height: 1.4;
display: inline-block;
color: var(--custom-header-icons);
}
